Well,
that's pretty unusual but today T-Mobile USA indeed announced the T-Mobile Dash
(which is just a rebranded HTC Excalibur) before any other European T-Mobile
subsidiary incl. T-Mobile Germany have announced it. In the past, T-Mobile USA
only followed but now they are leading.
So what's the T-Mobile Dash about? The Dash is based on High Tech Computer's
(HTC) Excalibur reference design (also used by O2 Germany for the O2 Xda cosmo)
and is Windows Mobile 5.0 Smartphone with QWERTY keyboard. Beside the support
for quadband GSM/GPRS/EDGE, the Dash also includes Bluetooth and Wi-Fi which
makes it such a unique BlackBerry-like Smartphone (yet because the Samsung
SGH-i600 will also include W-LAN).
In addition, the device is sporting a 1.3 megapixel camera and supports
T-Mobile's
new myFaves service with a dedicated Homescreen plugin:

The T-Mobile Dash (please note that it is neither called SDA Dash nor MDA
Dash which makes it even more unusual) will retail for US$ 349. With a two year
contract, T-Mobile is offering it for US$ 199; with a one year contract, it will
be available for US$ 249.
Last but not least, Engadget Mobile has already uploaded its review of the Dash
and T-Mobile indeed changed the
JOGGR functionality of its Excalibur version.

UPDATE 2: Funny, the "more info" page I've mentioned above is
currently showing more info about the new BlackBerry Pearl which isn't - AFAIK -
Windows Mobile-based at all. T-Mobile should better update the info-site before
they are going to send out press releases.